Posted by dannparks on Thursday, September 15, 2011 @ 04:57 PM:
While re-assembling N2188 I noticed that the rudder cable had a lot of drag. I dismantled the rear guides and noticed that the cable had worn a big slot into the nylon block. This was causing a large amount of friction.
I flipped the block around so the cable would wear on a new area and it made a huge difference. No more sticky rudders. The rudder springs also seemed much stronger than necessary. The strong springs may have contributed to the wear. I put in lighter springs and it seems to be much better. If your rudders feel sticky, it might be worth taking a look at the nylon block.
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Posted by jb92563 on Friday, September 16, 2011 @ 10:48 AM:
Good catch on that little detail.
However if you are going to go to the trouble of replacing it I would use a teflon block.
I bought some from McMaster-Carr and use it on things like this.
Its incredibly slippery and wears very little compared to nylon in this sort of application.
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Posted by Jorgen on Saturday, September 17, 2011 @ 04:08 AM:
Dear Fournieteers,
Great tips and great pictures! Is that hole step drilled or ground down?
May the 4's be with you/ Jörgen
Posted by dannparks on Saturday, September 17, 2011 @ 11:53 AM:
The hole has a large radiused edge, probably done with a router bit.
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Posted by dannparks on Sunday, September 18, 2011 @ 11:33 AM:
I should also mention that if you do replace the block with Teflon or Delrin, the hole needs to be drilled offset just like the original and installed in the same orientation as the original or the cables will rub on the slots exiting the fuselage.
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